RACH Beam Selection Logging for 5G Network Optimization

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Solution Overview

Problem

Current random access channel (RACH) reporting in wireless communication systems, particularly in 5G NR, is inadequate due to the complexity introduced by beam selection and power ramping, leading to suboptimal RACH configuration and increased delays in random access procedures.

Innovation Solution

Enhanced logging and reporting mechanisms at the user equipment (UE) level, which include detailed information about beam selection, power ramping, and collision events, are implemented to provide the network with more precise insights into RACH performance. This information is then used by the network to optimize RACH parameters such as beam mapping, initial power settings, maximum number of attempts, and beam selection thresholds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If enhanced logging and reporting mechanisms are implemented at UE level, then measurement precision is improved, but device complexity increases

Engineering Contradiction:

ImproveRACH performance monitoring accuracyVSAvoidUE logging and reporting complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The RACH report is segmented into multiple distinct information elements including beam selection information, power ramping information, and collision information. Each element is independently logged and reported, allowing the network to process specific aspects of RACH performance separately while reducing the overall complexity burden on the UE.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces new reporting parameters and information elements specifically for beam selection (SSB index, CSI-RS resource indicator), power ramping (transmission power, ramping counter), and collision detection. These parameter changes enable precise measurement of RACH performance without requiring complete redesign of the UE architecture.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If detailed beam selection and power ramping information is reported, then reliability is improved, but loss of time increases

Engineering Contradiction:

ImproveRACH configuration optimizationVSAvoidRandom access procedure delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The UE performs beam selection and power ramping procedures before the actual RACH preamble transmission. Detailed information about these preliminary actions is logged and reported to the network, enabling the network to pre-configure optimal parameters for subsequent RACH attempts, thereby reducing overall access delay while maintaining reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where the UE reports beam selection outcomes, power ramping results, and collision information to the network. The network uses this feedback to optimize RACH configuration parameters, creating a closed-loop system that improves reliability over time without significantly increasing access delay through efficient reporting triggers.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If comprehensive RACH information is collected and reported, then adaptability is improved, but loss of information decreases

Engineering Contradiction:

ImproveRACH configuration flexibilityVSAvoidReporting overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent extracts only the most critical RACH information elements for reporting, including beam selection identifiers, power ramping metrics, and collision indicators. By selecting and reporting only essential information rather than complete RACH procedure details, the system achieves adaptability in RACH configuration while minimizing reporting overhead and information loss.

Inventive Principle:

Principle #2Taking out (Extraction)

4Manufacturing precision

If beam selection information is logged for each RACH attempt, then manufacturing precision is improved, but ease of operation decreases

Engineering Contradiction:

ImproveBeam mapping accuracyVSAvoidRACH procedure complexity

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent implements a universal beam selection logging mechanism that works across different RACH scenarios (initial access, handover, beam failure recovery). The same logging and reporting structure is used regardless of the specific RACH context, enabling precise beam mapping without requiring separate procedures for each scenario, thereby maintaining ease of operation while achieving manufacturing precision.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250168896A1RACH report with beam selection information

Publication Date: 2025.05.22 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

According to some embodiments, a method for reporting random access attempts performed by a wireless device comprises performing a random access procedure, wherein the random access procedure comprises a plurality of random access attempts, and each random access attempt is associated with a beam. For each random access attempt, the method comprises, upon determining the random access attempt is unsuccessful, storing information about random access resources associated with the beam associated with the random access attempt. The method further comprises reporting the information about the random access resources associated with the beam to a network node.